Clutch mechanism for display devices.



PATENTED JUNE 19, 1906.

J. W. BRAGSTAD.

CLUTCH MECHANISM FOR DISPLAY DEVICES.

APPLICATION FILED AUG.22.1905.

Wayne v6 UNITED STATES,

PATENT OFFICE.

JOSEPH W. BRAGSTAD, or HURON, sourn DAKOTA.

CLUTCH MECHANISM FO R-DIZSPLAY DEVICES-- i Specification of Letters Patent.

Patented June. 119, 1906'.

Application filed August 22, 1905- $erial No. 275,248.

State of South Dakota, have invented certainnew and useful Improvements in Clutch Mechanism for Display Devices, of which the 5 following is a specification, reference beinghad therein to the accompanying drawings.

. for window-display devices and as applied wherein the motion of the carrier shall be intermittent and in the same direction of The mechanism is so constructed and arranged that the display-carrier shall travel for a certain period of time and shall be 7 at rest for an equal period, the traveling and stop ing operations of course occurring'altertravel.

nate y.

The invention relates more to a novel; form of power transmission for the displaycarrier than to' the carrier per se,

In the preferred embodiment of the i'llvention the construction comprises agear-train connected with a drive-shaft by a clutch. mechanism and provided with devices forthrowing the gear-train alternately intofand out of engagement with the clutch mehanism during redeterm'ined intervals of time in the trave of the master drive wheel irrespective of the form of drive-wheel employed. 1

The detailed construction will appear 1n the course of the following description, in

which reference is had to the accompanying drawings, forming a part of this specification, 1

like numerals designating like parts throughout the several views, wherein Figure 1 is a plan view illustrating. a novel form of clutch mechanism, Fig.- 2 is a view of the master drive-wheel, which isshown as a sprocket, and the clutch-wheel adapted to be engaged and operated thereby. Fig. 3 is a sectional view of the intermittent power devices shown in Fig. 2. Fig. 4 is a perspective view of a bracket for supporting the drive-shaft and which is provided with an arch-shaped arm that coacts with the master drive-wheel to throw the latter out of engagement with the clutch-wheel, and Fig. 5 is an enlarged erspective view of a portion of the master rive-wheel shown in elevation in Fig. 2.

1 arm 21, whi h presents a amrfac The This invention relates to certain new and useful improvements in clutch mechanism:

"through the medium of" a drive-Wheel 2:2 to that use primarily embodies an apparatus for operating an endless display-carrier f nction an pu p f th rm 21 wi b hereinafter described. The shaft'17 is driven during the periods of time when the latter is inengagement with the clutch-wheel 24, to be more fully described. The Wheel 22' is driven by a sprocket-chain 23, receiving ntionfrom an "suitable source. The s rocketwheel 22 is oosely mounted upon t e shaft 17 and is capable of a lateral sliding motion upon said shaft in its engagement with and disenga ement from the clutchewheel. Adjacent t e said drive-wheel 22 a wheel 24 is rigidly mounted upon the shaft 17, which owin to its function I designate a clutch.- whee The wheel 24 is" formed with a pair of shoulders 25., extending gradually from the periphery thereof, as is shown in dotted lines in Fig. These shoulders are arranged in diametrically opposite relation and extend also in opposite directions, The wheel 22 is formed on its inner face withan abutment 26, adapted for enga ement with the shoulders 25 of the clutc whe.el 24. The abutment 26 is arranged the same distance from the shaft 17 as the periphery of the wheel 24, so that said abutment in the 1 travel of the wheel :22 will lie directly in the path of the shoulders 25. Arranged adjacent the periphery of the wheel 22, and Ton the inner facethereof, I provide a second abutment 27, which is formed with a camface and-is disposed adjacent the abutment 26, the cam-surface of the abutment 27 extending some distance on the opposite side of the abutment 26.

To normally retain the wheel 22 in its p0; si'tion adjacent the wheel 24, but spaced therefrom by an annular centrally-disposed flange 22, I provide an expansive spring 28, interposed between the outer surface of the. wheel 22 and an adjustably-movable collar 29, held rigid upon the shaft 17 b set-screw30.

The operation is as follows: ssuming that the sprocket 22 is connected with a motor by the chain 23, said sprocket, as shown in the the cam-faced abutment 27 on said wheel 22 comes adjacent the cam-faced arm 21 of the supporting-bracket 19, at which time the abutment 27 will engage with its cam-face the arm 21, the latter by virtue of its engagementwith the abutment 27 then moving said wheel outwardly, and thereby disengaging the abutment 26 from the shoulder 25, the wheel 22 the while revolving independently of the clutch-wheel 24 and the shaft 17 until the abutment 27 has cleared the cam-faced arm 21, at which time the expansive spring 28 will force the sprocket 22 inwardly, and the abutment 26 at the completion of a semirevolution of the sprocket 22 will engage the next adjacent shoulder 25 and move the clutch-wheel 24 a semirevolution until the abutment 27 again engages the arm 21, at which time the operation above described will be repeated, and so on indefinitely. Thus the movement of the mechanism connected with shaft 17 will be dependent upon the intervals of engagement and disengagement of the wheels 22 and 24:. It is obvious that by increasing the number of shoulders 26 and by correspondingly increasing the number of camarms 21 the time between the disengagement and engagement of the two.

said power-transmission wheel adapted to engage said first-named extension at regular intervals during the rotary movement of said transmission-wheel,whereby to disengage said transmission-wheel from said drive-wheel and means for returning said power-transmission wheel into engagement with said drive-wheel after each disengagement therefrom.

2. A power-transmission gearing embodying in combination with a drive-shaft, a drivewheel rigidly mounted upon said shaft and formed with a clutch-face, a power-transmission wheel loosely mounted upon said shaft, power-transmission means connected to said power-transmission wheel, said power-transmission wheel being formed with a clutchface corresponding to the clutch-face on said drive-wheel, means for supporting said shaft, a cam-faced member carried by said supporting means, a cam-faced extension carried by said power-trans1nission wheel adapted to engage said cain-faced member at intervals during the rotatory movement of said wheel whereby to disengage the same from the drive-wheel and a spring for returning said power-transmission wheel into engagement with the drive-wheel after each disengagement thereof.

3. A power-transmission gearing embodying in combination with a drive-shaft, a drivewheel rigidly mounted upon said shaft and being formed with a clutch-face, a powertransmission wheel loosely mounted upon said drive-shaft, said power-transmission wheel being formed with a corresponding clutch-face whereby to engage said drivewheel, brackets for supporting said shaft, an arc-shaped arm carried by one of said brackets, a cam-faced extension carried by said transmission-wheel adapted to engage said arc-shaped arm at regular intervals during the rotatory movement of said transmissionwheel whereby to disengage the same from the drivewheel, and adjustable means for returning said powertrans1nission wheel into engagement with the drive-wheel after each disengagement thereof.

In testimony whereof I aflix my signature in the presence of two witnesses.

JOSEPH W. BRAGSTAD.

Witnesses:

A. A. CHAMBERLAIN, W. W. FARMER. 

